Remove System.Design and Drawing from codecov.yml file (#10678)

* Try to adjust the codecove.io in pipeline

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Co-authored-by: Simon Zhao <v-weidzh@microsoft.com>

codecov.yml

@@ -22,8 +22,6 @@ flags:                            # which files to include in the reporting
       - src/Common/src/
       - src/Microsoft.VisualBasic/src/
       - src/Microsoft.VisualBasic.Forms/src/
-      - src/System.Design/src/
-      - src/System.Drawing/src/
       - src/System.Drawing.Common/src/
       - src/System.Drawing.Design/src/
       - src/System.Private.Windows.Core/src/